Source : Webster's Revised Unabridged Dictionary (1913)

Mocking \Mock"ing\, a.
   Imitating, esp. in derision, or so as to cause derision;
   mimicking; derisive.

   {Mocking bird} (Zo["o]l.), a North American singing bird
      ({Mimus polyglottos}), remarkable for its exact imitations
      of the notes of other birds. Its back is gray; the tail
      and wings are blackish, with a white patch on each wing;
      the outer tail feathers are partly white. The name is also
      applied to other species of the same genus, found in
      Mexico, Central America, and the West Indies.

   {Mocking thrush} (Zo["o]l.), any species of the genus
      {Harporhynchus}, as the brown thrush ({H. rufus}).

   {Mocking wren} (Zo["o]l.), any American wren of the genus
      {Thryothorus}, esp. {T. Ludovicianus}.

Source : WordNet®

mocking thrush
     n : thrush-like American songbird able to mimic other birdsongs
         [syn: {thrasher}]